A manometer connected to a closed tap reads $4.5\times10^5\, pascal$. When the tap is opened the reading of the manometer falls to $4\times10^5\, pascal$. Then the velocity of flow of water is ........ $ms^{-1}$

  • A

    $7$

  • B

    $8$

  • C

    $9$

  • D

    $10$

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